fetch-pack: avoid quadratic behavior in remove_duplicates
[git/git.git] / remote.c
CommitLineData
5751f490
DB
1#include "cache.h"
2#include "remote.h"
3#include "refs.h"
6d21bf96
JH
4#include "commit.h"
5#include "diff.h"
6#include "revision.h"
8ca12c0d 7#include "dir.h"
ec8452d5 8#include "tag.h"
73cf0822 9#include "string-list.h"
5751f490 10
6ddba5e2
FC
11enum map_direction { FROM_SRC, FROM_DST };
12
e0aaa29f
DB
13static struct refspec s_tag_refspec = {
14 0,
15 1,
b84c343c 16 0,
08fbdb30
DB
17 "refs/tags/*",
18 "refs/tags/*"
e0aaa29f
DB
19};
20
21const struct refspec *tag_refspec = &s_tag_refspec;
22
844112ca
JH
23struct counted_string {
24 size_t len;
25 const char *s;
26};
55029ae4
DB
27struct rewrite {
28 const char *base;
844112ca
JH
29 size_t baselen;
30 struct counted_string *instead_of;
55029ae4
DB
31 int instead_of_nr;
32 int instead_of_alloc;
33};
d071d942
JT
34struct rewrites {
35 struct rewrite **rewrite;
36 int rewrite_alloc;
37 int rewrite_nr;
38};
55029ae4 39
5751f490 40static struct remote **remotes;
2d31347b
DB
41static int remotes_alloc;
42static int remotes_nr;
5751f490 43
cf818348 44static struct branch **branches;
2d31347b
DB
45static int branches_alloc;
46static int branches_nr;
cf818348
DB
47
48static struct branch *current_branch;
49static const char *default_remote_name;
fa685bdf 50static int explicit_default_remote_name;
cf818348 51
d071d942 52static struct rewrites rewrites;
1c2eafb8 53static struct rewrites rewrites_push;
55029ae4 54
5751f490
DB
55#define BUF_SIZE (2048)
56static char buffer[BUF_SIZE];
57
0a4da29d
DB
58static int valid_remote(const struct remote *remote)
59{
c578f51d 60 return (!!remote->url) || (!!remote->foreign_vcs);
0a4da29d
DB
61}
62
d071d942 63static const char *alias_url(const char *url, struct rewrites *r)
55029ae4
DB
64{
65 int i, j;
844112ca
JH
66 char *ret;
67 struct counted_string *longest;
68 int longest_i;
69
70 longest = NULL;
71 longest_i = -1;
d071d942
JT
72 for (i = 0; i < r->rewrite_nr; i++) {
73 if (!r->rewrite[i])
55029ae4 74 continue;
d071d942
JT
75 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
76 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
844112ca 77 (!longest ||
d071d942
JT
78 longest->len < r->rewrite[i]->instead_of[j].len)) {
79 longest = &(r->rewrite[i]->instead_of[j]);
844112ca 80 longest_i = i;
55029ae4
DB
81 }
82 }
83 }
844112ca
JH
84 if (!longest)
85 return url;
86
d071d942 87 ret = xmalloc(r->rewrite[longest_i]->baselen +
844112ca 88 (strlen(url) - longest->len) + 1);
d071d942
JT
89 strcpy(ret, r->rewrite[longest_i]->base);
90 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
844112ca 91 return ret;
55029ae4
DB
92}
93
5751f490
DB
94static void add_push_refspec(struct remote *remote, const char *ref)
95{
2d31347b
DB
96 ALLOC_GROW(remote->push_refspec,
97 remote->push_refspec_nr + 1,
98 remote->push_refspec_alloc);
99 remote->push_refspec[remote->push_refspec_nr++] = ref;
5751f490
DB
100}
101
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DB
102static void add_fetch_refspec(struct remote *remote, const char *ref)
103{
2d31347b
DB
104 ALLOC_GROW(remote->fetch_refspec,
105 remote->fetch_refspec_nr + 1,
106 remote->fetch_refspec_alloc);
107 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
5d46c9d4
DB
108}
109
28b91f8a 110static void add_url(struct remote *remote, const char *url)
5751f490 111{
2d31347b
DB
112 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
113 remote->url[remote->url_nr++] = url;
5751f490
DB
114}
115
20346234
MG
116static void add_pushurl(struct remote *remote, const char *pushurl)
117{
118 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
119 remote->pushurl[remote->pushurl_nr++] = pushurl;
120}
121
1c2eafb8
JT
122static void add_pushurl_alias(struct remote *remote, const char *url)
123{
124 const char *pushurl = alias_url(url, &rewrites_push);
125 if (pushurl != url)
126 add_pushurl(remote, pushurl);
127}
128
129static void add_url_alias(struct remote *remote, const char *url)
130{
131 add_url(remote, alias_url(url, &rewrites));
132 add_pushurl_alias(remote, url);
133}
134
5751f490
DB
135static struct remote *make_remote(const char *name, int len)
136{
2d31347b
DB
137 struct remote *ret;
138 int i;
5751f490 139
2d31347b
DB
140 for (i = 0; i < remotes_nr; i++) {
141 if (len ? (!strncmp(name, remotes[i]->name, len) &&
142 !remotes[i]->name[len]) :
143 !strcmp(name, remotes[i]->name))
144 return remotes[i];
5751f490
DB
145 }
146
2d31347b
DB
147 ret = xcalloc(1, sizeof(struct remote));
148 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
149 remotes[remotes_nr++] = ret;
5751f490 150 if (len)
2d31347b 151 ret->name = xstrndup(name, len);
5751f490 152 else
2d31347b
DB
153 ret->name = xstrdup(name);
154 return ret;
5751f490
DB
155}
156
cf818348
DB
157static void add_merge(struct branch *branch, const char *name)
158{
2d31347b
DB
159 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
160 branch->merge_alloc);
161 branch->merge_name[branch->merge_nr++] = name;
cf818348
DB
162}
163
164static struct branch *make_branch(const char *name, int len)
165{
2d31347b
DB
166 struct branch *ret;
167 int i;
cf818348
DB
168 char *refname;
169
2d31347b
DB
170 for (i = 0; i < branches_nr; i++) {
171 if (len ? (!strncmp(name, branches[i]->name, len) &&
172 !branches[i]->name[len]) :
173 !strcmp(name, branches[i]->name))
174 return branches[i];
cf818348
DB
175 }
176
2d31347b
DB
177 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
178 ret = xcalloc(1, sizeof(struct branch));
179 branches[branches_nr++] = ret;
cf818348 180 if (len)
2d31347b 181 ret->name = xstrndup(name, len);
cf818348 182 else
2d31347b 183 ret->name = xstrdup(name);
e8eec71d 184 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
cf818348 185 strcpy(refname, "refs/heads/");
2d31347b
DB
186 strcpy(refname + strlen("refs/heads/"), ret->name);
187 ret->refname = refname;
cf818348 188
2d31347b 189 return ret;
cf818348
DB
190}
191
d071d942 192static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
55029ae4
DB
193{
194 struct rewrite *ret;
195 int i;
196
d071d942 197 for (i = 0; i < r->rewrite_nr; i++) {
844112ca 198 if (len
d071d942
JT
199 ? (len == r->rewrite[i]->baselen &&
200 !strncmp(base, r->rewrite[i]->base, len))
201 : !strcmp(base, r->rewrite[i]->base))
202 return r->rewrite[i];
55029ae4
DB
203 }
204
d071d942 205 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
55029ae4 206 ret = xcalloc(1, sizeof(struct rewrite));
d071d942 207 r->rewrite[r->rewrite_nr++] = ret;
844112ca 208 if (len) {
55029ae4 209 ret->base = xstrndup(base, len);
844112ca
JH
210 ret->baselen = len;
211 }
212 else {
55029ae4 213 ret->base = xstrdup(base);
844112ca
JH
214 ret->baselen = strlen(base);
215 }
55029ae4
DB
216 return ret;
217}
218
219static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
220{
221 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
844112ca
JH
222 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
223 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
224 rewrite->instead_of_nr++;
55029ae4
DB
225}
226
5751f490
DB
227static void read_remotes_file(struct remote *remote)
228{
229 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
230
231 if (!f)
232 return;
89cf4c70 233 remote->origin = REMOTE_REMOTES;
5751f490
DB
234 while (fgets(buffer, BUF_SIZE, f)) {
235 int value_list;
236 char *s, *p;
237
238 if (!prefixcmp(buffer, "URL:")) {
239 value_list = 0;
240 s = buffer + 4;
241 } else if (!prefixcmp(buffer, "Push:")) {
242 value_list = 1;
243 s = buffer + 5;
5d46c9d4
DB
244 } else if (!prefixcmp(buffer, "Pull:")) {
245 value_list = 2;
246 s = buffer + 5;
5751f490
DB
247 } else
248 continue;
249
250 while (isspace(*s))
251 s++;
252 if (!*s)
253 continue;
254
255 p = s + strlen(s);
256 while (isspace(p[-1]))
257 *--p = 0;
258
259 switch (value_list) {
260 case 0:
55029ae4 261 add_url_alias(remote, xstrdup(s));
5751f490
DB
262 break;
263 case 1:
264 add_push_refspec(remote, xstrdup(s));
265 break;
5d46c9d4
DB
266 case 2:
267 add_fetch_refspec(remote, xstrdup(s));
268 break;
5751f490
DB
269 }
270 }
271 fclose(f);
272}
273
274static void read_branches_file(struct remote *remote)
275{
276 const char *slash = strchr(remote->name, '/');
cf818348 277 char *frag;
f285a2d7 278 struct strbuf branch = STRBUF_INIT;
5751f490
DB
279 int n = slash ? slash - remote->name : 1000;
280 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
281 char *s, *p;
282 int len;
283
284 if (!f)
285 return;
286 s = fgets(buffer, BUF_SIZE, f);
287 fclose(f);
288 if (!s)
289 return;
290 while (isspace(*s))
291 s++;
292 if (!*s)
293 return;
89cf4c70 294 remote->origin = REMOTE_BRANCHES;
5751f490
DB
295 p = s + strlen(s);
296 while (isspace(p[-1]))
297 *--p = 0;
298 len = p - s;
299 if (slash)
300 len += strlen(slash);
301 p = xmalloc(len + 1);
302 strcpy(p, s);
303 if (slash)
304 strcat(p, slash);
472fa4cd
DB
305
306 /*
307 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
308 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
309 * the partial URL obtained from the branches file plus
310 * "/netdev-2.6" and does not store it in any tracking ref.
311 * #branch specifier in the file is ignored.
312 *
313 * Otherwise, the branches file would have URL and optionally
314 * #branch specified. The "master" (or specified) branch is
315 * fetched and stored in the local branch of the same name.
316 */
cf818348
DB
317 frag = strchr(p, '#');
318 if (frag) {
319 *(frag++) = '\0';
472fa4cd
DB
320 strbuf_addf(&branch, "refs/heads/%s", frag);
321 } else
322 strbuf_addstr(&branch, "refs/heads/master");
323 if (!slash) {
324 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
cf818348 325 } else {
472fa4cd
DB
326 strbuf_reset(&branch);
327 strbuf_addstr(&branch, "HEAD:");
cf818348 328 }
55029ae4 329 add_url_alias(remote, p);
2af202be 330 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
18afe101
MK
331 /*
332 * Cogito compatible push: push current HEAD to remote #branch
333 * (master if missing)
334 */
335 strbuf_init(&branch, 0);
336 strbuf_addstr(&branch, "HEAD");
337 if (frag)
338 strbuf_addf(&branch, ":refs/heads/%s", frag);
339 else
340 strbuf_addstr(&branch, ":refs/heads/master");
2af202be 341 add_push_refspec(remote, strbuf_detach(&branch, NULL));
d71ab174 342 remote->fetch_tags = 1; /* always auto-follow */
5751f490
DB
343}
344
ef90d6d4 345static int handle_config(const char *key, const char *value, void *cb)
5751f490
DB
346{
347 const char *name;
348 const char *subkey;
349 struct remote *remote;
cf818348
DB
350 struct branch *branch;
351 if (!prefixcmp(key, "branch.")) {
352 name = key + 7;
353 subkey = strrchr(name, '.');
cf818348
DB
354 if (!subkey)
355 return 0;
896c0535 356 branch = make_branch(name, subkey - name);
cf818348 357 if (!strcmp(subkey, ".remote")) {
d2370cc2
JH
358 if (!value)
359 return config_error_nonbool(key);
cf818348 360 branch->remote_name = xstrdup(value);
fa685bdf 361 if (branch == current_branch) {
cf818348 362 default_remote_name = branch->remote_name;
fa685bdf
DB
363 explicit_default_remote_name = 1;
364 }
d2370cc2
JH
365 } else if (!strcmp(subkey, ".merge")) {
366 if (!value)
367 return config_error_nonbool(key);
cf818348 368 add_merge(branch, xstrdup(value));
d2370cc2 369 }
cf818348 370 return 0;
5751f490 371 }
55029ae4
DB
372 if (!prefixcmp(key, "url.")) {
373 struct rewrite *rewrite;
60e3aba9 374 name = key + 4;
55029ae4
DB
375 subkey = strrchr(name, '.');
376 if (!subkey)
377 return 0;
55029ae4 378 if (!strcmp(subkey, ".insteadof")) {
1c2eafb8
JT
379 rewrite = make_rewrite(&rewrites, name, subkey - name);
380 if (!value)
381 return config_error_nonbool(key);
382 add_instead_of(rewrite, xstrdup(value));
383 } else if (!strcmp(subkey, ".pushinsteadof")) {
384 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
55029ae4
DB
385 if (!value)
386 return config_error_nonbool(key);
387 add_instead_of(rewrite, xstrdup(value));
388 }
389 }
5751f490
DB
390 if (prefixcmp(key, "remote."))
391 return 0;
392 name = key + 7;
c82efafc
BC
393 if (*name == '/') {
394 warning("Config remote shorthand cannot begin with '/': %s",
395 name);
396 return 0;
397 }
5751f490
DB
398 subkey = strrchr(name, '.');
399 if (!subkey)
cd294bc3 400 return 0;
5751f490 401 remote = make_remote(name, subkey - name);
89cf4c70 402 remote->origin = REMOTE_CONFIG;
84bb2dfd
PB
403 if (!strcmp(subkey, ".mirror"))
404 remote->mirror = git_config_bool(key, value);
405 else if (!strcmp(subkey, ".skipdefaultupdate"))
406 remote->skip_default_update = git_config_bool(key, value);
7cc91a2f
BG
407 else if (!strcmp(subkey, ".skipfetchall"))
408 remote->skip_default_update = git_config_bool(key, value);
84bb2dfd
PB
409 else if (!strcmp(subkey, ".url")) {
410 const char *v;
411 if (git_config_string(&v, key, value))
412 return -1;
413 add_url(remote, v);
20346234
MG
414 } else if (!strcmp(subkey, ".pushurl")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 add_pushurl(remote, v);
5751f490 419 } else if (!strcmp(subkey, ".push")) {
84bb2dfd
PB
420 const char *v;
421 if (git_config_string(&v, key, value))
422 return -1;
423 add_push_refspec(remote, v);
5d46c9d4 424 } else if (!strcmp(subkey, ".fetch")) {
84bb2dfd
PB
425 const char *v;
426 if (git_config_string(&v, key, value))
427 return -1;
428 add_fetch_refspec(remote, v);
5751f490 429 } else if (!strcmp(subkey, ".receivepack")) {
84bb2dfd
PB
430 const char *v;
431 if (git_config_string(&v, key, value))
432 return -1;
5751f490 433 if (!remote->receivepack)
84bb2dfd 434 remote->receivepack = v;
5751f490
DB
435 else
436 error("more than one receivepack given, using the first");
0012ba21 437 } else if (!strcmp(subkey, ".uploadpack")) {
84bb2dfd
PB
438 const char *v;
439 if (git_config_string(&v, key, value))
440 return -1;
0012ba21 441 if (!remote->uploadpack)
84bb2dfd 442 remote->uploadpack = v;
0012ba21
DB
443 else
444 error("more than one uploadpack given, using the first");
d71ab174
DB
445 } else if (!strcmp(subkey, ".tagopt")) {
446 if (!strcmp(value, "--no-tags"))
447 remote->fetch_tags = -1;
944163a4
ST
448 else if (!strcmp(value, "--tags"))
449 remote->fetch_tags = 2;
14c98218 450 } else if (!strcmp(subkey, ".proxy")) {
84bb2dfd
PB
451 return git_config_string((const char **)&remote->http_proxy,
452 key, value);
c578f51d
DB
453 } else if (!strcmp(subkey, ".vcs")) {
454 return git_config_string(&remote->foreign_vcs, key, value);
84bb2dfd 455 }
5751f490
DB
456 return 0;
457}
458
55029ae4
DB
459static void alias_all_urls(void)
460{
461 int i, j;
462 for (i = 0; i < remotes_nr; i++) {
1c2eafb8 463 int add_pushurl_aliases;
55029ae4
DB
464 if (!remotes[i])
465 continue;
20346234 466 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
d071d942 467 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
20346234 468 }
1c2eafb8
JT
469 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
470 for (j = 0; j < remotes[i]->url_nr; j++) {
471 if (add_pushurl_aliases)
472 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
473 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
474 }
55029ae4
DB
475 }
476}
477
5751f490
DB
478static void read_config(void)
479{
480 unsigned char sha1[20];
481 const char *head_ref;
482 int flag;
2543d9b6 483 if (default_remote_name) /* did this already */
5751f490
DB
484 return;
485 default_remote_name = xstrdup("origin");
486 current_branch = NULL;
8cad4744 487 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
5751f490
DB
488 if (head_ref && (flag & REF_ISSYMREF) &&
489 !prefixcmp(head_ref, "refs/heads/")) {
cf818348
DB
490 current_branch =
491 make_branch(head_ref + strlen("refs/heads/"), 0);
5751f490 492 }
ef90d6d4 493 git_config(handle_config, NULL);
55029ae4 494 alias_all_urls();
5751f490
DB
495}
496
2cb1f36d
BC
497/*
498 * This function frees a refspec array.
499 * Warning: code paths should be checked to ensure that the src
500 * and dst pointers are always freeable pointers as well
501 * as the refspec pointer itself.
502 */
697d7f5d 503static void free_refspecs(struct refspec *refspec, int nr_refspec)
2cb1f36d
BC
504{
505 int i;
506
507 if (!refspec)
508 return;
509
510 for (i = 0; i < nr_refspec; i++) {
511 free(refspec[i].src);
512 free(refspec[i].dst);
513 }
514 free(refspec);
515}
516
24b6177e 517static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
6b62816c
DB
518{
519 int i;
520 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
46220ca1 521
6b62816c 522 for (i = 0; i < nr_refspec; i++) {
47c6ef1c 523 size_t llen;
46220ca1
JH
524 int is_glob;
525 const char *lhs, *rhs;
8d9c5010 526 int flags;
46220ca1 527
8e76bf3f 528 is_glob = 0;
46220ca1
JH
529
530 lhs = refspec[i];
531 if (*lhs == '+') {
6b62816c 532 rs[i].force = 1;
46220ca1 533 lhs++;
6b62816c 534 }
46220ca1
JH
535
536 rhs = strrchr(lhs, ':');
a83619d6
PB
537
538 /*
539 * Before going on, special case ":" (or "+:") as a refspec
540 * for matching refs.
541 */
542 if (!fetch && rhs == lhs && rhs[1] == '\0') {
543 rs[i].matching = 1;
544 continue;
545 }
546
46220ca1 547 if (rhs) {
47c6ef1c 548 size_t rlen = strlen(++rhs);
abd2bde7 549 is_glob = (1 <= rlen && strchr(rhs, '*'));
08fbdb30 550 rs[i].dst = xstrndup(rhs, rlen);
6b62816c 551 }
ef00d150 552
46220ca1 553 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
abd2bde7 554 if (1 <= llen && memchr(lhs, '*', llen)) {
7d19da46
JH
555 if ((rhs && !is_glob) || (!rhs && fetch))
556 goto invalid;
557 is_glob = 1;
7d19da46
JH
558 } else if (rhs && is_glob) {
559 goto invalid;
ef00d150 560 }
7d19da46 561
46220ca1
JH
562 rs[i].pattern = is_glob;
563 rs[i].src = xstrndup(lhs, llen);
8d9c5010 564 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
46220ca1
JH
565
566 if (fetch) {
567 /*
568 * LHS
569 * - empty is allowed; it means HEAD.
570 * - otherwise it must be a valid looking ref.
571 */
572 if (!*rs[i].src)
573 ; /* empty is ok */
8d9c5010
MH
574 else if (check_refname_format(rs[i].src, flags))
575 goto invalid;
46220ca1
JH
576 /*
577 * RHS
7d19da46 578 * - missing is ok, and is same as empty.
46220ca1
JH
579 * - empty is ok; it means not to store.
580 * - otherwise it must be a valid looking ref.
581 */
8d9c5010 582 if (!rs[i].dst)
46220ca1 583 ; /* ok */
8d9c5010 584 else if (!*rs[i].dst)
46220ca1 585 ; /* ok */
8d9c5010
MH
586 else if (check_refname_format(rs[i].dst, flags))
587 goto invalid;
46220ca1
JH
588 } else {
589 /*
590 * LHS
591 * - empty is allowed; it means delete.
592 * - when wildcarded, it must be a valid looking ref.
593 * - otherwise, it must be an extended SHA-1, but
594 * there is no existing way to validate this.
595 */
596 if (!*rs[i].src)
597 ; /* empty is ok */
598 else if (is_glob) {
8d9c5010 599 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
600 goto invalid;
601 }
602 else
603 ; /* anything goes, for now */
604 /*
605 * RHS
606 * - missing is allowed, but LHS then must be a
607 * valid looking ref.
608 * - empty is not allowed.
609 * - otherwise it must be a valid looking ref.
610 */
611 if (!rs[i].dst) {
8d9c5010 612 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
613 goto invalid;
614 } else if (!*rs[i].dst) {
615 goto invalid;
616 } else {
8d9c5010 617 if (check_refname_format(rs[i].dst, flags))
46220ca1
JH
618 goto invalid;
619 }
ef00d150 620 }
6b62816c
DB
621 }
622 return rs;
46220ca1
JH
623
624 invalid:
24b6177e 625 if (verify) {
2cb1f36d
BC
626 /*
627 * nr_refspec must be greater than zero and i must be valid
628 * since it is only possible to reach this point from within
629 * the for loop above.
630 */
631 free_refspecs(rs, i+1);
24b6177e
JF
632 return NULL;
633 }
46220ca1
JH
634 die("Invalid refspec '%s'", refspec[i]);
635}
636
24b6177e
JF
637int valid_fetch_refspec(const char *fetch_refspec_str)
638{
24b6177e
JF
639 struct refspec *refspec;
640
66dbfd55 641 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
2cb1f36d 642 free_refspecs(refspec, 1);
24b6177e
JF
643 return !!refspec;
644}
645
46220ca1
JH
646struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
647{
24b6177e 648 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
46220ca1
JH
649}
650
697d7f5d 651static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
46220ca1 652{
24b6177e 653 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
6b62816c
DB
654}
655
72ff8943
DB
656void free_refspec(int nr_refspec, struct refspec *refspec)
657{
658 int i;
659 for (i = 0; i < nr_refspec; i++) {
660 free(refspec[i].src);
661 free(refspec[i].dst);
662 }
663 free(refspec);
664}
665
df93e33c
DB
666static int valid_remote_nick(const char *name)
667{
8ca12c0d 668 if (!name[0] || is_dot_or_dotdot(name))
df93e33c
DB
669 return 0;
670 return !strchr(name, '/'); /* no slash */
671}
672
5751f490
DB
673struct remote *remote_get(const char *name)
674{
675 struct remote *ret;
fa685bdf 676 int name_given = 0;
5751f490
DB
677
678 read_config();
fa685bdf
DB
679 if (name)
680 name_given = 1;
681 else {
5751f490 682 name = default_remote_name;
fa685bdf
DB
683 name_given = explicit_default_remote_name;
684 }
9326d494 685
5751f490 686 ret = make_remote(name, 0);
df93e33c 687 if (valid_remote_nick(name)) {
0a4da29d 688 if (!valid_remote(ret))
5751f490 689 read_remotes_file(ret);
0a4da29d 690 if (!valid_remote(ret))
5751f490
DB
691 read_branches_file(ret);
692 }
0a4da29d 693 if (name_given && !valid_remote(ret))
55029ae4 694 add_url_alias(ret, name);
0a4da29d 695 if (!valid_remote(ret))
5751f490 696 return NULL;
46220ca1
JH
697 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
698 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
5751f490
DB
699 return ret;
700}
6b62816c 701
9a23ba33
FAG
702int remote_is_configured(const char *name)
703{
704 int i;
705 read_config();
706
707 for (i = 0; i < remotes_nr; i++)
708 if (!strcmp(name, remotes[i]->name))
709 return 1;
710 return 0;
711}
712
b42f6927
JS
713int for_each_remote(each_remote_fn fn, void *priv)
714{
715 int i, result = 0;
716 read_config();
2d31347b 717 for (i = 0; i < remotes_nr && !result; i++) {
b42f6927
JS
718 struct remote *r = remotes[i];
719 if (!r)
720 continue;
721 if (!r->fetch)
46220ca1
JH
722 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
723 r->fetch_refspec);
b42f6927 724 if (!r->push)
46220ca1
JH
725 r->push = parse_push_refspec(r->push_refspec_nr,
726 r->push_refspec);
b42f6927
JS
727 result = fn(r, priv);
728 }
729 return result;
730}
731
2467a4fa
DB
732void ref_remove_duplicates(struct ref *ref_map)
733{
183113a5 734 struct string_list refs = STRING_LIST_INIT_NODUP;
73cf0822
JP
735 struct string_list_item *item = NULL;
736 struct ref *prev = NULL, *next = NULL;
737 for (; ref_map; prev = ref_map, ref_map = next) {
738 next = ref_map->next;
2467a4fa
DB
739 if (!ref_map->peer_ref)
740 continue;
73cf0822 741
e8c8b713 742 item = string_list_lookup(&refs, ref_map->peer_ref->name);
73cf0822
JP
743 if (item) {
744 if (strcmp(((struct ref *)item->util)->name,
745 ref_map->name))
746 die("%s tracks both %s and %s",
747 ref_map->peer_ref->name,
748 ((struct ref *)item->util)->name,
749 ref_map->name);
750 prev->next = ref_map->next;
751 free(ref_map->peer_ref);
752 free(ref_map);
95c96d48
JP
753 ref_map = prev; /* skip this; we freed it */
754 continue;
2467a4fa 755 }
73cf0822 756
78a395d3 757 item = string_list_insert(&refs, ref_map->peer_ref->name);
73cf0822 758 item->util = ref_map;
2467a4fa 759 }
73cf0822 760 string_list_clear(&refs, 0);
2467a4fa
DB
761}
762
28b91f8a 763int remote_has_url(struct remote *remote, const char *url)
5d46c9d4
DB
764{
765 int i;
28b91f8a
SP
766 for (i = 0; i < remote->url_nr; i++) {
767 if (!strcmp(remote->url[i], url))
5d46c9d4
DB
768 return 1;
769 }
770 return 0;
771}
772
e928213f
DB
773static int match_name_with_pattern(const char *key, const char *name,
774 const char *value, char **result)
a3c84239 775{
08fbdb30
DB
776 const char *kstar = strchr(key, '*');
777 size_t klen;
abd2bde7
DB
778 size_t ksuffixlen;
779 size_t namelen;
08fbdb30
DB
780 int ret;
781 if (!kstar)
782 die("Key '%s' of pattern had no '*'", key);
783 klen = kstar - key;
abd2bde7
DB
784 ksuffixlen = strlen(kstar + 1);
785 namelen = strlen(name);
786 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
787 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
e928213f 788 if (ret && value) {
08fbdb30
DB
789 const char *vstar = strchr(value, '*');
790 size_t vlen;
abd2bde7 791 size_t vsuffixlen;
08fbdb30
DB
792 if (!vstar)
793 die("Value '%s' of pattern has no '*'", value);
794 vlen = vstar - value;
abd2bde7
DB
795 vsuffixlen = strlen(vstar + 1);
796 *result = xmalloc(vlen + vsuffixlen +
e928213f 797 strlen(name) -
abd2bde7
DB
798 klen - ksuffixlen + 1);
799 strncpy(*result, value, vlen);
800 strncpy(*result + vlen,
801 name + klen, namelen - klen - ksuffixlen);
802 strcpy(*result + vlen + namelen - klen - ksuffixlen,
803 vstar + 1);
e928213f 804 }
a3c84239
DB
805 return ret;
806}
807
c500352e 808static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
72ff8943
DB
809{
810 int i;
c500352e 811 int find_src = !query->src;
72ff8943 812
c500352e
CMN
813 if (find_src && !query->dst)
814 return error("query_refspecs: need either src or dst");
b42f6927 815
c500352e
CMN
816 for (i = 0; i < ref_count; i++) {
817 struct refspec *refspec = &refs[i];
818 const char *key = find_src ? refspec->dst : refspec->src;
819 const char *value = find_src ? refspec->src : refspec->dst;
820 const char *needle = find_src ? query->dst : query->src;
821 char **result = find_src ? &query->src : &query->dst;
b42f6927 822
c500352e 823 if (!refspec->dst)
5d46c9d4 824 continue;
c500352e 825 if (refspec->pattern) {
e928213f 826 if (match_name_with_pattern(key, needle, value, result)) {
c500352e 827 query->force = refspec->force;
5d46c9d4
DB
828 return 0;
829 }
b42f6927
JS
830 } else if (!strcmp(needle, key)) {
831 *result = xstrdup(value);
c500352e 832 query->force = refspec->force;
b42f6927 833 return 0;
5d46c9d4
DB
834 }
835 }
5d46c9d4
DB
836 return -1;
837}
838
c500352e
CMN
839char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
840 const char *name)
841{
842 struct refspec query;
843
844 memset(&query, 0, sizeof(struct refspec));
845 query.src = (char *)name;
846
847 if (query_refspecs(refspecs, nr_refspec, &query))
848 return NULL;
849
850 return query.dst;
851}
852
853int remote_find_tracking(struct remote *remote, struct refspec *refspec)
854{
855 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
856}
857
8009768e
RS
858static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
859 const char *name)
860{
861 size_t len = strlen(name);
862 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
863 memcpy(ref->name, prefix, prefixlen);
864 memcpy(ref->name + prefixlen, name, len);
865 return ref;
866}
867
59c69c0c 868struct ref *alloc_ref(const char *name)
dfd255dd 869{
59c69c0c 870 return alloc_ref_with_prefix("", 0, name);
737922aa
KK
871}
872
59a57757 873struct ref *copy_ref(const struct ref *ref)
d71ab174 874{
7b3db095
JS
875 struct ref *cpy;
876 size_t len;
877 if (!ref)
878 return NULL;
879 len = strlen(ref->name);
880 cpy = xmalloc(sizeof(struct ref) + len + 1);
881 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
882 cpy->next = NULL;
883 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
884 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
885 cpy->peer_ref = copy_ref(ref->peer_ref);
886 return cpy;
d71ab174
DB
887}
888
4577370e
DB
889struct ref *copy_ref_list(const struct ref *ref)
890{
891 struct ref *ret = NULL;
892 struct ref **tail = &ret;
893 while (ref) {
894 *tail = copy_ref(ref);
895 ref = ref->next;
896 tail = &((*tail)->next);
897 }
898 return ret;
899}
900
697d7f5d 901static void free_ref(struct ref *ref)
be885d96
DB
902{
903 if (!ref)
904 return;
7b3db095 905 free_ref(ref->peer_ref);
be885d96
DB
906 free(ref->remote_status);
907 free(ref->symref);
908 free(ref);
909}
910
dfd255dd
DB
911void free_refs(struct ref *ref)
912{
913 struct ref *next;
914 while (ref) {
915 next = ref->next;
be885d96 916 free_ref(ref);
dfd255dd
DB
917 ref = next;
918 }
919}
920
6b62816c
DB
921static int count_refspec_match(const char *pattern,
922 struct ref *refs,
923 struct ref **matched_ref)
924{
925 int patlen = strlen(pattern);
926 struct ref *matched_weak = NULL;
927 struct ref *matched = NULL;
928 int weak_match = 0;
929 int match = 0;
930
931 for (weak_match = match = 0; refs; refs = refs->next) {
932 char *name = refs->name;
933 int namelen = strlen(name);
6b62816c 934
ae36bdcf 935 if (!refname_match(pattern, name, ref_rev_parse_rules))
6b62816c
DB
936 continue;
937
938 /* A match is "weak" if it is with refs outside
939 * heads or tags, and did not specify the pattern
940 * in full (e.g. "refs/remotes/origin/master") or at
941 * least from the toplevel (e.g. "remotes/origin/master");
942 * otherwise "git push $URL master" would result in
943 * ambiguity between remotes/origin/master and heads/master
944 * at the remote site.
945 */
946 if (namelen != patlen &&
947 patlen != namelen - 5 &&
948 prefixcmp(name, "refs/heads/") &&
949 prefixcmp(name, "refs/tags/")) {
950 /* We want to catch the case where only weak
951 * matches are found and there are multiple
952 * matches, and where more than one strong
953 * matches are found, as ambiguous. One
954 * strong match with zero or more weak matches
955 * are acceptable as a unique match.
956 */
957 matched_weak = refs;
958 weak_match++;
959 }
960 else {
961 matched = refs;
962 match++;
963 }
964 }
965 if (!matched) {
966 *matched_ref = matched_weak;
967 return weak_match;
968 }
969 else {
970 *matched_ref = matched;
971 return match;
972 }
973}
974
1d735267 975static void tail_link_ref(struct ref *ref, struct ref ***tail)
6b62816c
DB
976{
977 **tail = ref;
1d735267
DB
978 while (ref->next)
979 ref = ref->next;
6b62816c 980 *tail = &ref->next;
6b62816c
DB
981}
982
67655246
FC
983static struct ref *alloc_delete_ref(void)
984{
985 struct ref *ref = alloc_ref("(delete)");
986 hashclr(ref->new_sha1);
987 return ref;
988}
989
6b62816c
DB
990static struct ref *try_explicit_object_name(const char *name)
991{
992 unsigned char sha1[20];
993 struct ref *ref;
6b62816c 994
67655246
FC
995 if (!*name)
996 return alloc_delete_ref();
6b62816c
DB
997 if (get_sha1(name, sha1))
998 return NULL;
59c69c0c 999 ref = alloc_ref(name);
6b62816c
DB
1000 hashcpy(ref->new_sha1, sha1);
1001 return ref;
1002}
1003
1d735267 1004static struct ref *make_linked_ref(const char *name, struct ref ***tail)
6b62816c 1005{
59c69c0c 1006 struct ref *ret = alloc_ref(name);
1d735267
DB
1007 tail_link_ref(ret, tail);
1008 return ret;
163f0ee5 1009}
8558fd9e 1010
f8aae120
JK
1011static char *guess_ref(const char *name, struct ref *peer)
1012{
1013 struct strbuf buf = STRBUF_INIT;
1014 unsigned char sha1[20];
1015
8cad4744 1016 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
f8aae120
JK
1017 if (!r)
1018 return NULL;
1019
1020 if (!prefixcmp(r, "refs/heads/"))
1021 strbuf_addstr(&buf, "refs/heads/");
1022 else if (!prefixcmp(r, "refs/tags/"))
1023 strbuf_addstr(&buf, "refs/tags/");
1024 else
1025 return NULL;
1026
1027 strbuf_addstr(&buf, name);
1028 return strbuf_detach(&buf, NULL);
1029}
1030
54a8ad92
JH
1031static int match_explicit(struct ref *src, struct ref *dst,
1032 struct ref ***dst_tail,
9a7bbd1d 1033 struct refspec *rs)
6b62816c 1034{
54a8ad92 1035 struct ref *matched_src, *matched_dst;
cdf690e5 1036 int copy_src;
8558fd9e 1037
54a8ad92 1038 const char *dst_value = rs->dst;
f8aae120 1039 char *dst_guess;
6b62816c 1040
a83619d6 1041 if (rs->pattern || rs->matching)
9a7bbd1d 1042 return 0;
8558fd9e 1043
54a8ad92
JH
1044 matched_src = matched_dst = NULL;
1045 switch (count_refspec_match(rs->src, src, &matched_src)) {
1046 case 1:
cdf690e5 1047 copy_src = 1;
54a8ad92
JH
1048 break;
1049 case 0:
1050 /* The source could be in the get_sha1() format
1051 * not a reference name. :refs/other is a
1052 * way to delete 'other' ref at the remote end.
1053 */
1054 matched_src = try_explicit_object_name(rs->src);
7dfee372 1055 if (!matched_src)
9a7bbd1d 1056 return error("src refspec %s does not match any.", rs->src);
cdf690e5 1057 copy_src = 0;
54a8ad92
JH
1058 break;
1059 default:
9a7bbd1d 1060 return error("src refspec %s matches more than one.", rs->src);
54a8ad92 1061 }
3c8b7df1 1062
4491e62a 1063 if (!dst_value) {
9f0ea7e8
DB
1064 unsigned char sha1[20];
1065 int flag;
1066
8cad4744 1067 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
9f0ea7e8
DB
1068 if (!dst_value ||
1069 ((flag & REF_ISSYMREF) &&
1070 prefixcmp(dst_value, "refs/heads/")))
1071 die("%s cannot be resolved to branch.",
1072 matched_src->name);
4491e62a 1073 }
3c8b7df1 1074
54a8ad92
JH
1075 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1076 case 1:
1077 break;
1078 case 0:
163f0ee5 1079 if (!memcmp(dst_value, "refs/", 5))
1d735267 1080 matched_dst = make_linked_ref(dst_value, dst_tail);
eeefa7c9 1081 else if ((dst_guess = guess_ref(dst_value, matched_src)))
f8aae120 1082 matched_dst = make_linked_ref(dst_guess, dst_tail);
3c8b7df1 1083 else
f8aae120
JK
1084 error("unable to push to unqualified destination: %s\n"
1085 "The destination refspec neither matches an "
1086 "existing ref on the remote nor\n"
1087 "begins with refs/, and we are unable to "
1088 "guess a prefix based on the source ref.",
1089 dst_value);
54a8ad92
JH
1090 break;
1091 default:
3c8b7df1 1092 matched_dst = NULL;
54a8ad92
JH
1093 error("dst refspec %s matches more than one.",
1094 dst_value);
1095 break;
1096 }
9a7bbd1d
JK
1097 if (!matched_dst)
1098 return -1;
1099 if (matched_dst->peer_ref)
1100 return error("dst ref %s receives from more than one src.",
54a8ad92 1101 matched_dst->name);
54a8ad92 1102 else {
cdf690e5 1103 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
54a8ad92 1104 matched_dst->force = rs->force;
6b62816c 1105 }
9a7bbd1d 1106 return 0;
54a8ad92
JH
1107}
1108
1109static int match_explicit_refs(struct ref *src, struct ref *dst,
1110 struct ref ***dst_tail, struct refspec *rs,
1111 int rs_nr)
1112{
1113 int i, errs;
1114 for (i = errs = 0; i < rs_nr; i++)
9a7bbd1d
JK
1115 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1116 return errs;
6b62816c
DB
1117}
1118
db70a04c 1119static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
6ddba5e2 1120 int send_mirror, int direction, const struct refspec **ret_pat)
8558fd9e 1121{
db70a04c
FC
1122 const struct refspec *pat;
1123 char *name;
8558fd9e 1124 int i;
a83619d6 1125 int matching_refs = -1;
8558fd9e 1126 for (i = 0; i < rs_nr; i++) {
a83619d6
PB
1127 if (rs[i].matching &&
1128 (matching_refs == -1 || rs[i].force)) {
1129 matching_refs = i;
1130 continue;
1131 }
1132
db70a04c
FC
1133 if (rs[i].pattern) {
1134 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
6ddba5e2
FC
1135 int match;
1136 if (direction == FROM_SRC)
1137 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1138 else
1139 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1140 if (match) {
db70a04c
FC
1141 matching_refs = i;
1142 break;
1143 }
1144 }
8558fd9e 1145 }
db70a04c 1146 if (matching_refs == -1)
a83619d6 1147 return NULL;
db70a04c
FC
1148
1149 pat = rs + matching_refs;
1150 if (pat->matching) {
1151 /*
1152 * "matching refs"; traditionally we pushed everything
1153 * including refs outside refs/heads/ hierarchy, but
1154 * that does not make much sense these days.
1155 */
1156 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1157 return NULL;
1158 name = xstrdup(ref->name);
1159 }
1160 if (ret_pat)
1161 *ret_pat = pat;
1162 return name;
8558fd9e
DB
1163}
1164
6d2bf96e
CB
1165static struct ref **tail_ref(struct ref **head)
1166{
1167 struct ref **tail = head;
1168 while (*tail)
1169 tail = &((*tail)->next);
1170 return tail;
1171}
1172
54a8ad92 1173/*
29753cdd
JH
1174 * Given the set of refs the local repository has, the set of refs the
1175 * remote repository has, and the refspec used for push, determine
1176 * what remote refs we will update and with what value by setting
1177 * peer_ref (which object is being pushed) and force (if the push is
1178 * forced) in elements of "dst". The function may add new elements to
1179 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
54a8ad92 1180 */
29753cdd
JH
1181int match_push_refs(struct ref *src, struct ref **dst,
1182 int nr_refspec, const char **refspec, int flags)
6b62816c 1183{
a83619d6 1184 struct refspec *rs;
28b9d6e5
AW
1185 int send_all = flags & MATCH_REFS_ALL;
1186 int send_mirror = flags & MATCH_REFS_MIRROR;
6ddba5e2 1187 int send_prune = flags & MATCH_REFS_PRUNE;
5f48cb95 1188 int errs;
2af202be 1189 static const char *default_refspec[] = { ":", NULL };
b1d8b1f3 1190 struct ref *ref, **dst_tail = tail_ref(dst);
6b62816c 1191
a83619d6
PB
1192 if (!nr_refspec) {
1193 nr_refspec = 1;
1194 refspec = default_refspec;
1195 }
1196 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
6d2bf96e 1197 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
6b62816c
DB
1198
1199 /* pick the remainder */
b1d8b1f3 1200 for (ref = src; ref; ref = ref->next) {
6b62816c 1201 struct ref *dst_peer;
6e66bf3c
AR
1202 const struct refspec *pat = NULL;
1203 char *dst_name;
db70a04c 1204
b1d8b1f3 1205 if (ref->peer_ref)
6b62816c 1206 continue;
a83619d6 1207
6ddba5e2 1208 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
db70a04c 1209 if (!dst_name)
a83619d6
PB
1210 continue;
1211
6d2bf96e 1212 dst_peer = find_ref_by_name(*dst, dst_name);
a83619d6
PB
1213 if (dst_peer) {
1214 if (dst_peer->peer_ref)
1215 /* We're already sending something to this ref. */
1216 goto free_name;
a83619d6
PB
1217 } else {
1218 if (pat->matching && !(send_all || send_mirror))
1219 /*
1220 * Remote doesn't have it, and we have no
1221 * explicit pattern, and we don't have
1222 * --all nor --mirror.
1223 */
1224 goto free_name;
28b9d6e5 1225
6b62816c 1226 /* Create a new one and link it */
6d2bf96e 1227 dst_peer = make_linked_ref(dst_name, &dst_tail);
b1d8b1f3 1228 hashcpy(dst_peer->new_sha1, ref->new_sha1);
6b62816c 1229 }
b1d8b1f3 1230 dst_peer->peer_ref = copy_ref(ref);
a83619d6 1231 dst_peer->force = pat->force;
6e66bf3c
AR
1232 free_name:
1233 free(dst_name);
6b62816c 1234 }
6ddba5e2
FC
1235 if (send_prune) {
1236 /* check for missing refs on the remote */
1237 for (ref = *dst; ref; ref = ref->next) {
1238 char *src_name;
1239
1240 if (ref->peer_ref)
1241 /* We're already sending something to this ref. */
1242 continue;
1243
1244 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1245 if (src_name) {
1246 if (!find_ref_by_name(src, src_name))
1247 ref->peer_ref = alloc_delete_ref();
1248 free(src_name);
1249 }
1250 }
1251 }
5f48cb95
JS
1252 if (errs)
1253 return -1;
6b62816c
DB
1254 return 0;
1255}
cf818348 1256
20e8b465
TRC
1257void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1258 int force_update)
1259{
1260 struct ref *ref;
1261
1262 for (ref = remote_refs; ref; ref = ref->next) {
1263 if (ref->peer_ref)
1264 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1265 else if (!send_mirror)
1266 continue;
1267
1268 ref->deletion = is_null_sha1(ref->new_sha1);
1269 if (!ref->deletion &&
1270 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1271 ref->status = REF_STATUS_UPTODATE;
1272 continue;
1273 }
1274
1275 /* This part determines what can overwrite what.
1276 * The rules are:
1277 *
1278 * (0) you can always use --force or +A:B notation to
1279 * selectively force individual ref pairs.
1280 *
1281 * (1) if the old thing does not exist, it is OK.
1282 *
1283 * (2) if you do not have the old thing, you are not allowed
1284 * to overwrite it; you would not know what you are losing
1285 * otherwise.
1286 *
1287 * (3) if both new and old are commit-ish, and new is a
1288 * descendant of old, it is OK.
1289 *
1290 * (4) regardless of all of the above, removing :B is
1291 * always allowed.
1292 */
1293
1294 ref->nonfastforward =
1295 !ref->deletion &&
1296 !is_null_sha1(ref->old_sha1) &&
1297 (!has_sha1_file(ref->old_sha1)
1298 || !ref_newer(ref->new_sha1, ref->old_sha1));
1299
1300 if (ref->nonfastforward && !ref->force && !force_update) {
1301 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1302 continue;
1303 }
1304 }
1305}
1306
cf818348
DB
1307struct branch *branch_get(const char *name)
1308{
1309 struct branch *ret;
1310
1311 read_config();
1312 if (!name || !*name || !strcmp(name, "HEAD"))
1313 ret = current_branch;
1314 else
1315 ret = make_branch(name, 0);
1316 if (ret && ret->remote_name) {
1317 ret->remote = remote_get(ret->remote_name);
1318 if (ret->merge_nr) {
1319 int i;
1320 ret->merge = xcalloc(sizeof(*ret->merge),
1321 ret->merge_nr);
1322 for (i = 0; i < ret->merge_nr; i++) {
1323 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1324 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
5e6e2b48
MG
1325 if (remote_find_tracking(ret->remote, ret->merge[i])
1326 && !strcmp(ret->remote_name, "."))
1327 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
cf818348
DB
1328 }
1329 }
1330 }
1331 return ret;
1332}
1333
1334int branch_has_merge_config(struct branch *branch)
1335{
1336 return branch && !!branch->merge;
1337}
1338
85682c19
SP
1339int branch_merge_matches(struct branch *branch,
1340 int i,
1341 const char *refname)
cf818348 1342{
85682c19 1343 if (!branch || i < 0 || i >= branch->merge_nr)
cf818348 1344 return 0;
605b4978 1345 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
cf818348 1346}
d71ab174 1347
4577370e 1348static struct ref *get_expanded_map(const struct ref *remote_refs,
d71ab174
DB
1349 const struct refspec *refspec)
1350{
4577370e 1351 const struct ref *ref;
d71ab174
DB
1352 struct ref *ret = NULL;
1353 struct ref **tail = &ret;
1354
e928213f 1355 char *expn_name;
d71ab174
DB
1356
1357 for (ref = remote_refs; ref; ref = ref->next) {
1358 if (strchr(ref->name, '^'))
1359 continue; /* a dereference item */
e928213f
DB
1360 if (match_name_with_pattern(refspec->src, ref->name,
1361 refspec->dst, &expn_name)) {
d71ab174 1362 struct ref *cpy = copy_ref(ref);
d71ab174 1363
e928213f
DB
1364 cpy->peer_ref = alloc_ref(expn_name);
1365 free(expn_name);
d71ab174
DB
1366 if (refspec->force)
1367 cpy->peer_ref->force = 1;
1368 *tail = cpy;
1369 tail = &cpy->next;
1370 }
1371 }
1372
1373 return ret;
1374}
1375
4577370e 1376static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
d71ab174 1377{
4577370e 1378 const struct ref *ref;
d71ab174 1379 for (ref = refs; ref; ref = ref->next) {
605b4978 1380 if (refname_match(name, ref->name, ref_fetch_rules))
d71ab174
DB
1381 return ref;
1382 }
1383 return NULL;
1384}
1385
4577370e 1386struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
d71ab174 1387{
4577370e 1388 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
d71ab174
DB
1389
1390 if (!ref)
9ad7c5ae 1391 return NULL;
d71ab174
DB
1392
1393 return copy_ref(ref);
1394}
1395
1396static struct ref *get_local_ref(const char *name)
1397{
3eb96997 1398 if (!name || name[0] == '\0')
d71ab174
DB
1399 return NULL;
1400
59c69c0c
RS
1401 if (!prefixcmp(name, "refs/"))
1402 return alloc_ref(name);
d71ab174
DB
1403
1404 if (!prefixcmp(name, "heads/") ||
1405 !prefixcmp(name, "tags/") ||
8009768e
RS
1406 !prefixcmp(name, "remotes/"))
1407 return alloc_ref_with_prefix("refs/", 5, name);
d71ab174 1408
8009768e 1409 return alloc_ref_with_prefix("refs/heads/", 11, name);
d71ab174
DB
1410}
1411
4577370e 1412int get_fetch_map(const struct ref *remote_refs,
d71ab174 1413 const struct refspec *refspec,
9ad7c5ae
JH
1414 struct ref ***tail,
1415 int missing_ok)
d71ab174 1416{
ef00d150 1417 struct ref *ref_map, **rmp;
d71ab174
DB
1418
1419 if (refspec->pattern) {
1420 ref_map = get_expanded_map(remote_refs, refspec);
1421 } else {
9ad7c5ae
JH
1422 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1423
1424 ref_map = get_remote_ref(remote_refs, name);
1425 if (!missing_ok && !ref_map)
1426 die("Couldn't find remote ref %s", name);
1427 if (ref_map) {
1428 ref_map->peer_ref = get_local_ref(refspec->dst);
1429 if (ref_map->peer_ref && refspec->force)
1430 ref_map->peer_ref->force = 1;
1431 }
d71ab174
DB
1432 }
1433
ef00d150
DB
1434 for (rmp = &ref_map; *rmp; ) {
1435 if ((*rmp)->peer_ref) {
8d9c5010
MH
1436 if (check_refname_format((*rmp)->peer_ref->name + 5,
1437 REFNAME_ALLOW_ONELEVEL)) {
ef00d150
DB
1438 struct ref *ignore = *rmp;
1439 error("* Ignoring funny ref '%s' locally",
1440 (*rmp)->peer_ref->name);
1441 *rmp = (*rmp)->next;
1442 free(ignore->peer_ref);
1443 free(ignore);
1444 continue;
1445 }
1446 }
1447 rmp = &((*rmp)->next);
d71ab174
DB
1448 }
1449
8f70a765
AR
1450 if (ref_map)
1451 tail_link_ref(ref_map, tail);
d71ab174
DB
1452
1453 return 0;
1454}
be885d96
DB
1455
1456int resolve_remote_symref(struct ref *ref, struct ref *list)
1457{
1458 if (!ref->symref)
1459 return 0;
1460 for (; list; list = list->next)
1461 if (!strcmp(ref->symref, list->name)) {
1462 hashcpy(ref->old_sha1, list->old_sha1);
1463 return 0;
1464 }
1465 return 1;
1466}
6d21bf96 1467
ec8452d5
JS
1468static void unmark_and_free(struct commit_list *list, unsigned int mark)
1469{
1470 while (list) {
1471 struct commit_list *temp = list;
1472 temp->item->object.flags &= ~mark;
1473 list = temp->next;
1474 free(temp);
1475 }
1476}
1477
1478int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1479{
1480 struct object *o;
1481 struct commit *old, *new;
1482 struct commit_list *list, *used;
1483 int found = 0;
1484
1485 /* Both new and old must be commit-ish and new is descendant of
1486 * old. Otherwise we require --force.
1487 */
1488 o = deref_tag(parse_object(old_sha1), NULL, 0);
1489 if (!o || o->type != OBJ_COMMIT)
1490 return 0;
1491 old = (struct commit *) o;
1492
1493 o = deref_tag(parse_object(new_sha1), NULL, 0);
1494 if (!o || o->type != OBJ_COMMIT)
1495 return 0;
1496 new = (struct commit *) o;
1497
1498 if (parse_commit(new) < 0)
1499 return 0;
1500
1501 used = list = NULL;
1502 commit_list_insert(new, &list);
1503 while (list) {
1504 new = pop_most_recent_commit(&list, TMP_MARK);
1505 commit_list_insert(new, &used);
1506 if (new == old) {
1507 found = 1;
1508 break;
1509 }
1510 }
1511 unmark_and_free(list, TMP_MARK);
1512 unmark_and_free(used, TMP_MARK);
1513 return found;
1514}
1515
6d21bf96
JH
1516/*
1517 * Return true if there is anything to report, otherwise false.
1518 */
1519int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1520{
1521 unsigned char sha1[20];
1522 struct commit *ours, *theirs;
1523 char symmetric[84];
1524 struct rev_info revs;
1525 const char *rev_argv[10], *base;
1526 int rev_argc;
1527
1528 /*
1529 * Nothing to report unless we are marked to build on top of
1530 * somebody else.
1531 */
1532 if (!branch ||
1533 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1534 return 0;
1535
1536 /*
1537 * If what we used to build on no longer exists, there is
1538 * nothing to report.
1539 */
1540 base = branch->merge[0]->dst;
c6893323 1541 if (read_ref(base, sha1))
6d21bf96 1542 return 0;
57ffc5f8 1543 theirs = lookup_commit_reference(sha1);
6d21bf96
JH
1544 if (!theirs)
1545 return 0;
1546
c6893323 1547 if (read_ref(branch->refname, sha1))
6d21bf96 1548 return 0;
57ffc5f8 1549 ours = lookup_commit_reference(sha1);
6d21bf96
JH
1550 if (!ours)
1551 return 0;
1552
1553 /* are we the same? */
1554 if (theirs == ours)
1555 return 0;
1556
8fbf879e 1557 /* Run "rev-list --left-right ours...theirs" internally... */
6d21bf96
JH
1558 rev_argc = 0;
1559 rev_argv[rev_argc++] = NULL;
1560 rev_argv[rev_argc++] = "--left-right";
1561 rev_argv[rev_argc++] = symmetric;
1562 rev_argv[rev_argc++] = "--";
1563 rev_argv[rev_argc] = NULL;
1564
1565 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1566 strcpy(symmetric + 40, "...");
1567 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1568
1569 init_revisions(&revs, NULL);
1570 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1571 prepare_revision_walk(&revs);
1572
1573 /* ... and count the commits on each side. */
1574 *num_ours = 0;
1575 *num_theirs = 0;
1576 while (1) {
1577 struct commit *c = get_revision(&revs);
1578 if (!c)
1579 break;
1580 if (c->object.flags & SYMMETRIC_LEFT)
1581 (*num_ours)++;
1582 else
1583 (*num_theirs)++;
1584 }
c0234b2e
JH
1585
1586 /* clear object flags smudged by the above traversal */
1587 clear_commit_marks(ours, ALL_REV_FLAGS);
1588 clear_commit_marks(theirs, ALL_REV_FLAGS);
6d21bf96
JH
1589 return 1;
1590}
1591
1592/*
1593 * Return true when there is anything to report, otherwise false.
1594 */
1595int format_tracking_info(struct branch *branch, struct strbuf *sb)
1596{
1597 int num_ours, num_theirs;
4de53ce0 1598 const char *base;
6d21bf96
JH
1599
1600 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1601 return 0;
1602
1603 base = branch->merge[0]->dst;
45972ffb 1604 base = shorten_unambiguous_ref(base, 0);
6d21bf96 1605 if (!num_theirs)
8a5b7494
JX
1606 strbuf_addf(sb,
1607 Q_("Your branch is ahead of '%s' by %d commit.\n",
1608 "Your branch is ahead of '%s' by %d commits.\n",
1609 num_ours),
1610 base, num_ours);
6d21bf96 1611 else if (!num_ours)
8a5b7494
JX
1612 strbuf_addf(sb,
1613 Q_("Your branch is behind '%s' by %d commit, "
1614 "and can be fast-forwarded.\n",
1615 "Your branch is behind '%s' by %d commits, "
1616 "and can be fast-forwarded.\n",
1617 num_theirs),
1618 base, num_theirs);
6d21bf96 1619 else
8a5b7494
JX
1620 strbuf_addf(sb,
1621 Q_("Your branch and '%s' have diverged,\n"
1622 "and have %d and %d different commit each, "
1623 "respectively.\n",
1624 "Your branch and '%s' have diverged,\n"
1625 "and have %d and %d different commits each, "
1626 "respectively.\n",
1627 num_theirs),
1628 base, num_ours, num_theirs);
6d21bf96
JH
1629 return 1;
1630}
454e2025
JS
1631
1632static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1633{
1634 struct ref ***local_tail = cb_data;
1635 struct ref *ref;
1636 int len;
1637
1638 /* we already know it starts with refs/ to get here */
8d9c5010 1639 if (check_refname_format(refname + 5, 0))
454e2025
JS
1640 return 0;
1641
1642 len = strlen(refname) + 1;
1643 ref = xcalloc(1, sizeof(*ref) + len);
1644 hashcpy(ref->new_sha1, sha1);
1645 memcpy(ref->name, refname, len);
1646 **local_tail = ref;
1647 *local_tail = &ref->next;
1648 return 0;
1649}
1650
1651struct ref *get_local_heads(void)
1652{
55f0566f 1653 struct ref *local_refs = NULL, **local_tail = &local_refs;
454e2025
JS
1654 for_each_ref(one_local_ref, &local_tail);
1655 return local_refs;
1656}
8ef51733 1657
4229f1fa
JS
1658struct ref *guess_remote_head(const struct ref *head,
1659 const struct ref *refs,
1660 int all)
8ef51733 1661{
8ef51733 1662 const struct ref *r;
4229f1fa
JS
1663 struct ref *list = NULL;
1664 struct ref **tail = &list;
8ef51733 1665
6cb4e6cc 1666 if (!head)
8ef51733
JS
1667 return NULL;
1668
fbb074c2
JK
1669 /*
1670 * Some transports support directly peeking at
1671 * where HEAD points; if that is the case, then
1672 * we don't have to guess.
1673 */
1674 if (head->symref)
1675 return copy_ref(find_ref_by_name(refs, head->symref));
1676
8ef51733 1677 /* If refs/heads/master could be right, it is. */
4229f1fa
JS
1678 if (!all) {
1679 r = find_ref_by_name(refs, "refs/heads/master");
1680 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1681 return copy_ref(r);
1682 }
8ef51733
JS
1683
1684 /* Look for another ref that points there */
4229f1fa 1685 for (r = refs; r; r = r->next) {
61adfd30
JK
1686 if (r != head &&
1687 !prefixcmp(r->name, "refs/heads/") &&
1688 !hashcmp(r->old_sha1, head->old_sha1)) {
4229f1fa
JS
1689 *tail = copy_ref(r);
1690 tail = &((*tail)->next);
1691 if (!all)
1692 break;
1693 }
1694 }
8ef51733 1695
4229f1fa 1696 return list;
8ef51733 1697}
f2ef6075
JS
1698
1699struct stale_heads_info {
f2ef6075
JS
1700 struct string_list *ref_names;
1701 struct ref **stale_refs_tail;
ed43de6e
CMN
1702 struct refspec *refs;
1703 int ref_count;
f2ef6075
JS
1704};
1705
1706static int get_stale_heads_cb(const char *refname,
1707 const unsigned char *sha1, int flags, void *cb_data)
1708{
1709 struct stale_heads_info *info = cb_data;
ed43de6e
CMN
1710 struct refspec query;
1711 memset(&query, 0, sizeof(struct refspec));
1712 query.dst = (char *)refname;
1713
1714 if (query_refspecs(info->refs, info->ref_count, &query))
1715 return 0; /* No matches */
1716
1717 /*
1718 * If we did find a suitable refspec and it's not a symref and
1719 * it's not in the list of refs that currently exist in that
1720 * remote we consider it to be stale.
1721 */
1722 if (!((flags & REF_ISSYMREF) ||
1723 string_list_has_string(info->ref_names, query.src))) {
1724 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1725 hashcpy(ref->new_sha1, sha1);
f2ef6075 1726 }
ed43de6e
CMN
1727
1728 free(query.src);
f2ef6075
JS
1729 return 0;
1730}
1731
ed43de6e 1732struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
f2ef6075
JS
1733{
1734 struct ref *ref, *stale_refs = NULL;
183113a5 1735 struct string_list ref_names = STRING_LIST_INIT_NODUP;
f2ef6075 1736 struct stale_heads_info info;
f2ef6075
JS
1737 info.ref_names = &ref_names;
1738 info.stale_refs_tail = &stale_refs;
ed43de6e
CMN
1739 info.refs = refs;
1740 info.ref_count = ref_count;
f2ef6075 1741 for (ref = fetch_map; ref; ref = ref->next)
1d2f80fa 1742 string_list_append(&ref_names, ref->name);
f2ef6075
JS
1743 sort_string_list(&ref_names);
1744 for_each_ref(get_stale_heads_cb, &info);
1745 string_list_clear(&ref_names, 0);
1746 return stale_refs;
1747}